package com.sky.acpect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/*
* 自定义切面，实现公共字段自动填充
* */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /*
    * 切入点
    * */

    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}


    /*
    * 前置通知
    *
    * 使用前置通知，实现给公共字段自动填充
    *
    * updateTime
    * updateUser
    * */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint)  {
        log.info("开始进行公共字段填充");

        /*
        * 1. 获取当前被拦截的方法的操作类型
        * 2. 获取当前拦截的方法参数
        * 3. 根据对应的操作类型，为对应的字段赋值
        * 4. 准备赋值的数据 —— 当前时间 + 当前用户
        * 5. 根据不同的操作类型，为对应的字段赋值
        * */

        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = null;
        if (annotation != null) {
            operationType = annotation.value();
        }else {
            return;
        }
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0){
            return;
        }
        Object entity = args[0];
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

       try {
           Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
           Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
           Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
           Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
           if (operationType == OperationType.INSERT){
               log.info("为{}赋值", entity.getClass());
                setCreateTime.invoke(entity, now);
                setUpdateTime.invoke(entity, now);
                setCreateUser.invoke(entity, currentId);
                setUpdateUser.invoke(entity, currentId);


           }
           if (operationType == OperationType.UPDATE){
               log.info("为{}赋值", entity.getClass());

               setUpdateTime.invoke(entity, now);
               setUpdateUser.invoke(entity, currentId);
           }

       }catch (Exception e){
          e.printStackTrace();
       }
    }
}
